Cuprian, light yellow, round#644

A very nice light yellow, cuprian, round  #644 I discovered this yellow had copper with my spectrometer. The round stays yellow and is very bright and eye clean. It weighs 2.67 carats and is quite rare because of its copper content.

I did not buy the rough for this gemstone as cuprian and I did not know it was cuprian until I check it out with my spectrometer.  I have no idea whether the copper content effects the color of this round, but it does make it more interesting.

The posted round, without any concerns about copper, is a beautiful gemstone.  It is a determined light yellow that stays yellow.  And when I had to test it under the twisted florescent light in a yellowish shade, the bright yellow rays were practically blinding.  It is complete eye clean and has excellent crystal, which is unusual for cuprian material from Mozambique.  I should say this, that it is the case for the purples anyway.   This beautiful and rare round weighs 2.67 carats.


About Bruce Fry

I was born in Summit, NJ in 1947 and graduated from Summit High School in 1966. I graduated from the Colorado School of Mines in 1970 and after spending another year in graduate school, I left to see the world of Brazil. After spending some more time discovering myself, I ended up working for the Commonwealth of Pennsylvania for 32 years as an Air Quality Engineer in the Department of Environmental Protection. I retired in 2007 and took up faceting gemstones again after a long hiatus that reached back to my twenties. I had started cutting cabochons when I was 13 and bought my first faceting machine when I was 15, but ran out of money and time until I retired. My great love in gemology is tourmaline and the collection presented here represents my effort to get as much beauty and variety in the colors of tourmaline as I can. I was particularly lucky in being able to get unheated cuprian tourmaline before copper was discovered in gem grade tourmaline from Mozambique.
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